Three austenitic steels (18Cr-8Ni, 18Cr-10Ni, and 21Cr-30Ni) exploited for long periods of time at temperatures between 600°C and 800°C were investigated. In the investigation, electrochemical potentiokinetic reactivation-double loop (EPR-DL) and oxalic acid etch corrosion tests, metallography, scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, and energy-dispersive x-ray spectroscopy were used. In the severe sensitized 18Cr-8Ni steel, small, densely arranged intergranular particles, mostly of M23C6, were found. The 18Cr-10Ni steel was classified as less-sensitized compared to the 18Cr-8Ni steel as a result of the presence of larger, discrete grain boundary particles in addition to small, densely arranged particles. In the unsensitized 21Cr-30Ni steel, huge, discrete clusters often exceeding 10 μm were observed at the grain boundaries. The clusters were found to consist of large Cr-rich M23C6 and small Ti-rich MC particles.
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1 June 2009
Research Article|
June 01 2009
Corrosion Resistance of Power Plant Components Exploited for Long Terms at 600, 650, and 800°C
P. Gogola;
P. Gogola
‡
*Institute of Materials Science, Faculty of Materials Science and Technology, Slovak University of Technology, Bottova 24, 917 24 Trnava,
Slovak Republic
.‡Corresponding author. E-mail: [email protected].
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T. Kuníková;
T. Kuníková
**PSL, a.s., Robotnícka ul., 017 01 Považská Bystrica,
Slovak Republic
.
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M. Dománková;
M. Dománková
*Institute of Materials Science, Faculty of Materials Science and Technology, Slovak University of Technology, Bottova 24, 917 24 Trnava,
Slovak Republic
.
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P. Ševc;
P. Ševc
***Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice,
Slovak Republic
.
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S. Tuleja;
S. Tuleja
****Department of Materials Science, Metallurgical Faculty, Technical University of Košice, Park Komenského 11, 042 00 Košice,
Slovak Republic
.
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L’. Čaplovič;
L’. Čaplovič
*Institute of Materials Science, Faculty of Materials Science and Technology, Slovak University of Technology, Bottova 24, 917 24 Trnava,
Slovak Republic
.
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M. Vach;
M. Vach
*Institute of Materials Science, Faculty of Materials Science and Technology, Slovak University of Technology, Bottova 24, 917 24 Trnava,
Slovak Republic
.
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J. Janovec
J. Janovec
*Institute of Materials Science, Faculty of Materials Science and Technology, Slovak University of Technology, Bottova 24, 917 24 Trnava,
Slovak Republic
.
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‡Corresponding author. E-mail: [email protected].
Online ISSN: 1938-159X
Print ISSN: 0010-9312
NACE International
2009
CORROSION (2009) 65 (6): 355–358.
Citation
P. Gogola, T. Kuníková, M. Dománková, P. Ševc, S. Tuleja, L’. Čaplovič, M. Vach, J. Janovec; Corrosion Resistance of Power Plant Components Exploited for Long Terms at 600, 650, and 800°C. CORROSION 1 June 2009; 65 (6): 355–358. https://doi.org/10.5006/1.3319140
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